Self-opening die-head



Nov. 15, 1932. A. F. BREITENSTEIN SELF OPENING DIE- HEAD Filed May 2, 1930 2 Sheets-Sheet '1 Nov. 15, 1932. A. F. BREITENSTEIN 1,888,067

SELF OPENING DIE HEAD Filed May 2, 1930 '2 SheetsSheet 2 s7 2 52 I W mk Z620- l Patented Nov. 15', 1932 I UNITED ALBERT F. BREIIENSTEIN, on NEW HAVEN;- jconuncsricur, AssIe oR o THE GEOMETRIC TOOL COMPANY, on. NEW AVE oonu'nou'ntcnr, a 'oonron'arion SELE-QPENING min-HEAD Application. filed May a,"

This inventionrelates to an improvement in self-opening die-heads and particularlyv to an improvement in-that class of self-open ing die-heads .in which the. chasers are mounted in a chaser-carryingmember which is mounted,-in turn, with capacity for inde pendent reciprocating movement in a mounting-member designed to be secured in the,

turret or other appropriate featureof a machine.

Heretofore, it has been an extremely diflicult operation to cut threads of time pitch and of delicate form ona so-called production basis? without occasioning a large amount of spoilage due to the tendency of the chasers .to strip. such relatively-delicate threads; i

The main object of this invention is to produce a convenient and reliable self-opening die-head constructed with particular reference to the sensitiveness of its tripping mechanism, whereby threads of fine pitch and delicate form may be rapidly and accurately cut without danger. of stripping.

W'iththe above and other objects in View as will appear from the following, my invention consists in a the type which is automatically tripped for the retirement of its chasers by the forward draft exerted by the workupon a floating chaser-carrying member, and characterized by 1mm means engageable with an external abutment for imparting relative forward motion to the said floating chaser-carrying member for'releasing the said c'hasers, where by the tool may be tripped either by the forward draft exerted by the work or by the said means, to adapt the tool for use in work in which the threads out are too delicate to withstand the pull required to release the chasers. f V

My invention further consists in a self opening die-head characterized as above and having certain other details of construction and combinations ofparts as will be hereinafter described and particularly recited in the claim.

In the accompanying drawings: Fig. 1 is a view in side elevation of a self-v 'line- 8T 8 of'Fig. 3; i a,

1 Fig. 9 is a corresponding view taken on the i i V I i 1 Fig. lOis' a view in side elevation of the self-opening die-head of 1930. Serial No. 449,233.

opening die-head embodying my invention I 2 is a view of the rear end thereof; Fig. 3 is a .view thereof in front elevation;

Fig. 4 is view thereof in vertical central longitudinal section, 'withthe partsin the pos tions due to them when the chasers are in their cutting positionsp;

V Fig. 5is a similar view with the parts there of in the positions due to them when'the diehead is about to open ;v V

F 1g. 6 1sfa similar View withtlie'parts thereof in the positions due to them when the chasers havebeen automatically retired out of engagement with the work; 7

Fig. 7 isa brokennlongitudinal sectional View taken on the line 77 of Fig. 3; i Fig.8 is a corresponding view taken on the line 99 of Fig. 3;

mounting-member detached;

perspective View of means of which the fixture mounted in a turret-.25, or other appropriatefeature, of any machine suitable for threading operations. I At its forward end, the said mountingmember 20 isprovided with a concentric bore 26. for .the sliding reception with four radially-arranged slots28 receiv ing radlally movable chasers 29 'havingtheir inner ends formed with cutting-teeth 30; and thelr outer ends provided with bevels 31 forco-action'. with beveled notches-32 located Fg. lljis a'view thereof in rear elevation; and

7 0f" the hollow" shank 2? of the chaser-carrying member '21,

the forward face of which latter is provided within the forward end ofthe sleeve-like chaser-operating member 22, which is slidably mounted upon the forward end of the chaser carrying member 21'...

. Each of the chasers 29 is provided, near its iii).

outer end, with a rearwardly-extending pin 33, engaged by a plunger 34 normally urged outward by a spring 35, the said plunger and spring being located in a radial bore 36 formed in the chaser-carrying member 21, and inter-communicatingwith the radial slots 28 aforesaid.

At its rear end, the sleeve-likechasereopcn ating member 22 is internally-threaded for the reception ofthe externally threaded tubular forward end of an adjusting-ring 37, virtually forming a partof thesaid chaseroperating member and sliding upon the periphery of the mounting-member 20, the

flanged rear end of the said ring being provided with radialv wrenchesockets 38 forthe application of an ordinary spanner wrench,

by means of which the ring is turned inward orxoutward as desired, with respect to the operating-member 22, so .as'to change the po: sition of thebevelednotches 32 therein, with respect to the locking-memberf23, whereby theidiameter of the threadscutlby the chasers maybe varied. .v

The forward face of the flanged rear end-of the adjusting-ring 37 is provided with an annular seriesof circular shallow seats .or de pressions 39, with any one ofwhich a frictionplunger a0 is normally engaged for. preventing the accidental rotation of the ring 37' with respectfto the chaser-operating". member 22, which latterisformed with a bore ll for the reception of the said plunger 40, and also for. the reception of thespring 12 byimeansof which the same is urged into engagement with any given one of theseries of seats .39,

For preventing the relative rotation of the chaser-carrying member 21 with respect to the chaser-operating member 22 without interfering, with their relative rectilinear movement, I employ two lockingepins 4: 3 driven intov and, projecting forward from an annular, :hearingsrib ll formed within the chaser- Qperating member. 22 and entering passages I la in the chaser-carrier, as shown'i-n Fig. 8,.

I To. provide, for moving the. chaser-operate ing memberj22 rearward with respect to the chaser-carrying member 21 forthe. purpose of permitting the. chasers to move into. their open positions underthe urge oftheir springs 35,, I'employ two springs 46, located diametrically oppositeeach other-in registered bores liand a8, respectively formed. in the said members 21 and 22, as shown inFig. 9. Each. spring. 46 encircles alguide-pin 4:9 mounted tioned whichis located: in a forwardly and inwardly-inclined substantially semi-circular slot 50 formed in the mounting-member 20. This locking-member is formed at its rear end with a segmental external locking-rib 51, the forward edge of which co-acts with the forward wall of a shallow Circumferential internal locking-groove 52 formed in the adjusting-ring 37 Near its forward end the locking-member 23 is formed with a segmental internal coupling-rib 53 entering a corresponding couplinmgroove 5a formed in the shank 27 of the ciprocating movement of the said I chaser- .carrylng member as will hereinafter appear. In order to disengage-the forward edge of its lockingerib .51 from-the forward wall of the internal groove 52,-the lockingemeiriber23 before referred to is concurrently moved in+ ward as well as forward byits provision with a bevel 55 forming its forward faceand riding upon the for-ward wall 56 of the inclined slot 5.0 in the mountinganemberz20.

For re-locking the fixture with the chasers 2,9 in their inward or cutting positions, the locking-member 23 is concurrently moved rearward and outward for the re-entrance of ser-carrying member 21 whereby the said loelgingemember partlcipates in the reits locking-rib 5.1 into the groove 52 when the chaser-carrying member 21 is moved rearward with respect tothe inounti-ng:member 20, as will hereinafterappear. For this purpose, the said locking-member is-forin-ed with a beveled rear face 57 cowacting with the rear wall 58 of the inclined slot 50.

For effecting the forward movement of the chaser-operating sleeve 22 and the concur-v rent rearward movement of the chaser-carry ing member 21 with respect to. the mountingmeinber 20 .=and for the purpose of moving the i I chasers 29, inward into th-eircutting positions and concurrently re-entering the locking-rib 51 of the lock-ingemember 234 into the lockinggroove 52, I employ a resetting-handle 59 rocking on a pin 60 located in a'clearancepassage 61 in the chaser-operating member 22, the spherically-contoured inner end 62 of the said lever passing throngh :a clearance passage 63 in the mountinganembei 20 and into a socket 64 in the shank 27 of the chasercarrying member 21. h

'For limiting the chaser-opening Increment of the .ChHS'QI'TOPQIQ-hlIlg member 22, I employ plunger 65 mounted in abushing66, screwed into the periphery of the chasei operating member 22 and at'its inner end entering an elongated recess 67 formed in the periphery oft-he mounting-member 20 and having at its rear end a hardened abutment-pin 68 against w'hiijh't-he inner end of the plunger 65 impinges. The said-plunger is normally-held in the-recess, 67by-"a spring 69 located within the bushing 66.

For the retraction ofthe.-'plunger 65: from the recess 67 to. permit the operating-member "assets? to move into its chaser-clearanceposition, it is provided with a knurled finger-button 7 0. Under the construction and arrangement ofparts above described, itwill be; seen that the chaser-carrying member 21 and the chaser-operating member 22 have capacity for relative rectilinear movement with respect to each other as well as with respect to the mounting-member 20, this being one of the characteristic features of my improved self-opening die-head.

Coming now to the salient feature of my invention, I employ atripping-dog or lever 71 hung upon a transverse pivot-pin 72 in a radial clearance-passage 73 formed in the mounting-member 20 at the junction point of,

the body-portion proper thereof and" its hollow shank 24, as clearly shown in Figs. 4 to 6 inclusive. The pivotal dog 71 is provided with arelat-ively-long outwardly-prd jecting tail 74 adapted to engage with a suit able abutment such as 75, forming a feature of the machine in which my improved diehead is used. t

The opposite or inner end of the dog 71 is formed with a nose 1 76 engaging the rear end of a thrust-transmitting member in the form of a pin 77 arranged parallel with the axis of the die-head and driven into a socket 7 8 rea-rwardly opening from the rear end of the hollow shank 27 of the chaser-carrying member 21. The said thrust-pin 77, for all purposes of function, forms an integral part of the shank 27 of the chaser-carrying member 21 and extends rearward through a clear ance-bore 79 in the mounting-member 20 between the concentric-bore 26 thereof and the radial clearance-passage 73 thereof.

In the use of my improved die-head, the work represented by the broken lines 80 in Figs. 4 to 6 inclusive, is rotated in the usual manner while the die-head is bodily moved.

toward the work on the axial line thereof by the turret 25, or by whatever other fixture the die-head may be mounted in, the die-head being at this time reset and locked with the chasers 29 in their cutting positions, as shown in Fig. 4.

The cutting edges of the chasersnow engage with the work 80 and begin the cutting operation during which the die-head is urged axially toward the work with more or less pressure as required. When the desired length of thread has been out upon the work,

the tail 7 1 of the tripping-dog 71 will have engaged the abutment 75 and been swung into the position in which it is shown in Fig. 5.

The swinging movement of the trippingdog 71, as just above described, will effect the relative forward axial movement of the chaser-carrying member 21 with respect to the mounting-member 20 and owingto the fact that the locking-member 23 is positively coupled to the said chaser-carrying member 21, it will be moved bodily inward as well as forward into theposition in which it is shownin Fig.- 5, in which its locking-rib'51 1 'is all but disengaged from the forward wall of the locking-groove 52 in the adjustingr1ng37." Y

A slight additional swinging movement of the tripping-dog-71 will 'efi'ect a slight further relative forward movement of the chaser-carryingmember21 and hence a further inward movement of the locking-member 23 with the effect of entirely disengaging the locking-rib 51 of the latter from the forward edge of the locking-groove'52, thereby which they are shown in Fig. 6.in whichthe v resetting-handle 59 is rearwardly inclined;

The' die-head beingnow disengaged from v the work, it is bodily retired and a new piece of work-is'put in place; The die-head is now reset by swingingf'the resetting-handle 59 from rear to front, thus eifecting the forward axial movement of the chaser-operating sleeve 22 independently'of the chaser-carryingmember 21 and of the mounting-member 20,:whereby the forward wall of'the an' nular locking-groove 52 is moved forward and brought into line with the forward edge of the locking-rib 51' upon the locking-member 23. Thisv phase of the resetting opera.-' tion-moves the parts from the positions in which theyare shown in' Fig. '6 into the positions in which they'are'show'n in Fig. 5.

Now inasmuch as the shank 27 of the chaser operating member 22 forms one of the fulcra ofthe resetting-handle 59, the chaser carrying member 21 will be urged axlally rearward at the. same time-that the operating-member .is being moved-forward by the handle 59. Therefore, at the instant the forward edge of thelocking-rib.51registers'with the forward wall of the locking-groove 52,

the chaser-carrying member will move slight- 1 1y rearward, whereby the locking-member 23 willhave its rear face 57' forced against the rear wall 58 of the inclinedslot50r with the effect of positively moving the locking-member outward as well as rearward so as to cause its locking-rib 51 to enter the locking-groove;

52. 'In this last phase, the parts move from the positions in which they are shown in Fig. 5 into the positions in Fig. 4.

in which theyare shown '7' I The die-head now having been reset, is' ad: v'anc'ed to the Work-andthe'cycle of operation above detailed is repeated. a

My improved die-head-is also adapted to be tripped independent of the tripping-dog;

71 in the usual manner of the so-called pullotf die-heads, by the action of the Work inthreadingitself into the chasers (after the bodily advance of the entire fiirtu-rehas been halted, all as is Well understood inthe art and as described in detail in U. -S.-Patent No. 1,643,832,:grantedto, me September 27, 1927.

I am, of courselaware that tripping-dogs are old'in the art of self-opening die-heads, but What I, Wish to call particular attention to is that the particulartripping-dog shown and described herein acts in a novel manner tomove the \floating chaser-carrying member :Ql-bodily forward W'ithrespec't, to the tary arm extending outwardly away from the die-head structure in position to engage an external abutment.

In testimony-whereof, I have signed this specification. p p

' ALBERT F. J3EEI'IEN S'I-EIN.v

It will be understood those skilled the a'rt thatmy invention mayassume Varied physical forms Without departing from my inventive concept and I, therefore, do not limit myself to the specific embodiment herein chosen'for illustration, but only as indicated in the appended claim,

' I claim:

A self-opening die-head including a v mounting-member having a clearance-passage; a'fioating chaser-carryingmember carried' by "the said mounting-member With capacity for axial movementwith respect there to and 'providedwith a rearv'vardly-ofisetting thrust-transmitting member entering at its rear end the said clearance-passage in'the said mounting-member; Chasers installed in the said chaser-carrying member; a chaseroperating member for controllingfthe said chasers; a locking-member installed In. the 7 7 said mounting-member with capacity for ie ciprocating movement in japlane inclined with respect to the axis of the diehead and operatively connected to the said chaser-operating member and the said chaser-carrying member for locking the former and'being'released by azrelative forward movement of the latter; atripping-leverpivotally carried intermediate its ends by the said mountingmember and having-one arm extended inwardly into the aforesaid clearance-passage therein and-engaging the rear portion of the thrust-transmitting member-of the chaser-V carrying member and having a complemen 

